Ballet in the water or synchronised swimming. This discipline is a graceful, feminine sport, where ladies (and as of recently mixed duets) perform different technical elements, formations in and under the water surface accompanied to music.
The events of masters are solo, duet, mixed duet, team and free combination. Technical and free solos are together constitute one event. Similary, the two routines together is one event in duet, mixed duet and team. The free combination by itself is one event.